Which best describes an example of an n-type semiconductor?
it uses phosphorus so that electrical conduction is due to the movement of electrons.
it uses phosphorus so that electrical conduction is due to the movement of a positive charge.
it uses gallium so that electrical conduction is due to the movement of electrons.
oit uses gallium so that electrical conduction is due to the movement of a positive charge.

Answer:

Explanation:

Given that:

For a first order instrument with a sensitivity of .4 mV/K

constant c  = 25 ms = 25 × 10⁻³ s

The initial temperature \(T_1\) = 273 K

The final temperature \(T_2\) = 473 K

The initial volume = 0.4 mV/K × 273 K = 109.2 V

The final volume =  0.4 mV/K × 473 K =  189.2 V

the instrument’s response as a function of time for a sudden temperature increase can be computed as follows:

Let consider y to be the function of time i.e y(t).

So;

y(t) = 109.2  + (189.2 - 109.2)( 1 - \(\mathbf{e^{-t/c}}\))mV

y(t) = (109.2 +  80 ( 1 - \(\mathbf{e^{t/25\times 10^{-3}}}\))) mV

Plot the response y(t) as a function of time.

The plot of y(t) as a function of time can be seen in the diagram  attached below.

What are the units for y(t)?

The unit for y(t) is mV.

Find the 90% rise time for y(t90) and the error fraction,

The 90% rise time for y(t90) is as follows:

Initially 90% of 189.2 mV = 0.9 ×  189.2 mV

=  170.28 mV

170.28 mV = (109.2 +  80 ( 1 - \(\mathbf{e^{t/25\times 10^{-3}}}\))) mV

170.28 mV - 109.2 mV = 80 ( 1 - \(\mathbf{e^{t/25\times 10^{-3}}}\))) mV

61.08 mV =  80 ( 1 - \(\mathbf{e^{t/25\times 10^{-3}}}\))) mV

0.7635  mV = ( 1 - \(\mathbf{e^{t/25\times 10^{-3}}}\))) mV

t = 1.44 × 25  × 10⁻³ s

t = 0.036 s

t = 36 ms

The error fraction = \(\dfrac{189.2-170.28 }{189.2}\)

The error fraction = 0.1

The error fraction = 10%

Despite the fact that the moon is slightly larger than Pluto, the two bodies are vastly different, and their unique characteristics make them both interesting objects of study for astronomers and space scientists.

Yes, the way things work on Earth's moon would be different from the way they work on Pluto, despite the fact that Earth's moon is slightly larger than Pluto's. This is because the characteristics of a celestial body depend on various factors such as its size, mass, density, and distance from the sun.

One major difference between the two is the gravitational force. The gravitational force on the moon is about one-sixth of that on Earth, while on Pluto, it is about one-fifteenth of that on Earth. This means that objects on the surface of the moon would weigh less than those on Pluto, and they would also fall more slowly.

Another significant difference is the surface conditions. The moon has a relatively smooth surface with little atmosphere and extreme temperature variations, while Pluto has a much more rugged terrain, a thin atmosphere, and a much colder surface with temperatures reaching -240°C.

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Answer:

the answer is 3.8m/s in meters per second

The length of the delay between carbon emissions and their effects on oceans is around several decades to centuries.

The oceans play a significant role in absorbing excess carbon dioxide (CO2) from the atmosphere. However, the absorption of CO2 results in the ocean becoming more acidic, which could be detrimental to marine life and their habitats. As a result, an increase in carbon emissions leads to negative impacts on the oceans over time. To add to this, Carbon dioxide, a greenhouse gas, has an impact on the Earth's climate.

The greenhouse effect, which results from excessive carbon dioxide in the atmosphere, causes the Earth's temperature to rise, resulting in climate change. Because the oceans play such a crucial role in the Earth's climate, they are also significantly impacted by rising temperatures. As a result, it is critical to consider the long-term effects of carbon emissions on the oceans and take action to reduce them.

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Answer:

Hands opening a bottle with bottle opener

Answer:

Analyse the material required to build the instrument gauge and then keep a buffer stock of 1%

Explanation:

The right quantity to buy differs for every material. There are some materials which are very expensive and are very less used than buffer stock for such materials cannot be purchased. Usually the buffer is to be on the safe side from the shortage of the material. The buffer stock kept is around 1 to 2% for metal materials.

Answer:

A. It pulls objects towards the center of Earth.

Explanation:

Think about dropping something, where does it go? If you are on earth, this goes down towards the ground due to the attractive force of gravity on every object (to pull everything to center of earth). Like Newton's apple.

The velocity of an object includes direction of the motion of an object whereas speed does not include direction. Thus, the correct options for 1, 2, 3, 4, and 5 are B, B, A, A, and B, respectively.

Velocity can be defined as the directional speed of an object in the motion as an indication of the rate of change in the position of an object as observed from a particular frame of reference by the observer and as measured by a particular standard of time.

The velocity is different from that of speed as it is a vector quantity, the velocity of an object includes direction of the motion of an object whereas speed does not include direction.

Track runners cover same distance however, the winner in the race is the one who covers the particular distance in less time than other competitors.

The slowest runner in the graph is the one represented with blue color. This is because, this runner took maximum time to cover the distance.

The distance covered by the train is 300 miles in time period of 6 hours. Therefore, the speed of the train will be the distance covered by the train divided by the total time taken.

Speed of the train = 300 miles/ 6 hours

Speed of the train = 50 miles per hour.

The example of velocity is the one with the unit of length per time. From the given options, 80 miler per hour is an example of velocity as miles is the unit of length and hour is the unit of time.

Therefore, the correct options for 1, 2, 3, 4, and 5 are B, B, A, A, and B, respectively.

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For a radio station broadcasts at a frequency of 83.8 MHz with a power of 16.5 kW, the number of photons is mathematically given as

P=6.92*10^{29}photon/sec

Generally, the equation for the energy   is mathematically given as

E=hf

Therefore

E=6.63*10^{34}*83*10^6

E=5.561*10^26J

In conclusion, the number of photons

P=dN/dt

P=38500/5.561*10^{26}

P=6.92*10^{29}photon/sec

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Answer:

Hertz is the S.I. unit of frequency and is used to measure a wave's frequency . So, option A frequency is the correct answer.

Answer:

25.13 ft

Explanation:

r = 4 feet

ω=0.25 revolution per minute

=1 revolution in  4 minutes  

total number of revolution N = 1 (in 4 minutes )

v=rω

distance traveled = 2×N×π×r

=2×1×π×4  

=8π

= 25.13ft in 4mins

Power is defined as the rate of change of work done.

The quantity of energy transferred or transformed per unit of time is known as power.

The equations for calculating the power of an object are,

Power,

P = W/t                where W is the work done and t is the time.

P = F(d/t)             where F is the force, d is the distance.

P = ΔE/t               where ΔE is the change in energy.

P = Fv                  where v is the velocity.

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Answer: So, circumference equals (I’m just gonna rewrite the formula to help us follow our work), =×, equals pi times diameter. So now all we need to do is to plug in our number for diameter. This is equal to, and also we said pi is equal to 3.14, =(3.14)(9 cm)=28.26 cm.

Explanation: I think this right, if not, please let me know. :D

Momentum is never created or destroyed. It is conserved.

The cue stick gave the cue ball all the momentum there is on the table.  There's nothing on the table that can pour in any more momentum.

After the strike, with 15 or 16 balls rolling every which way around the table, the total momentum of all of them combined will be the same as the cue ball's momentum right now, before the strike.

The fringe occurs at an angle of approximately 0.0449 radians.

The angle at which the fringe that is most distant from the central bright fringe occurs can be determined using the formula:

θ = λ / d,

where θ is the angle, λ is the wavelength of the light, and d is the separation between the slits.

Substituting the given values into the formula, we have:

θ = (589 nm) / (0.0131 mm)

= (589 x 10⁻⁹ m) / (0.0131 x 10⁻³ m)

= 0.0449 radians.

Therefore, the fringe that is most distant from the central bright fringe will occur at an angle of approximately 0.0449 radians relative to the original direction of the beam.

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Answer:

MAILING A CHECK = NO NEED TO SHARE BANKING INFO

SUBMITTING AN ONLINE PAYMENT = QUICK PAYMENT PROCESSING

AUTOMATIC WITHDRAWL = CONSISTENCY IN ON-TIME BILL PAYMENT

Explanation:

Just did it on Edge.

The match of column 1 with column 2 will be a-2,b-3,c-1.The match the column is all about the online payment.

The way of transferring the money with the help of UPI, QR code through the laptop or smartphone is known as the online payment.

The given column in the problem is;

a.) automatic withdrawal      1. quick payment processing

b)mailing a check                  2. consistency in on-time bill payment

c)submitting an online payment  3.no need to share banking information

The correct option is;

a)The automatic withdrawal leads to consistency in on-time bill payment.

b)In Mailing a check there is no need to share the bank information.

c)In submitting an online payment the payment processing is quick.

The benefits of the online payment are;

Helps you save time, reduces the number of days a sale is outstanding, More Effective. It eliminates the need for cash and checks. labor Costs are Reduced, theft Probability Is Minimal, it's a Lot Easier to Manage

Hence the match of column 1 with column 2 will be a-2,b-3, and c-1..

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In order to apply the relationship o, a torsional member must be made of a ductile material, be homogeneous, and have a constant diameter.

A torsional member is subject to torsional or twisting forces. The relationship "o" represents the angle of twist or torsion in the member. To ensure this relationship holds, the following conditions must be met:

Ductile material: The torsional member should be made of a material that exhibits ductility. Ductility is the ability of a material to deform plastically without breaking. Ductile materials can withstand the twisting forces without fracturing, allowing for a reliable measurement of the angle of twist.

Homogeneity: The torsional member must be homogeneous, meaning it has uniform properties throughout its cross-section. If the member has varying material properties, such as different stiffness or strength, it can lead to uneven distribution of torsional forces and affect the accuracy of the relationship o.

Constant diameter: The torsional member should have a constant diameter along its length. This ensures that the distribution of torsional stresses remains uniform throughout the member. If the diameter varies, it can cause stress concentration points and lead to inaccurate measurements of the angle of twist.

In summary, a torsional member must be made of a ductile material to withstand the twisting forces, be homogeneous to maintain uniform properties and have a constant diameter to ensure accurate measurements of the angle of the twist.

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Answer:

your pretty no matter what others say

Explanation:

Answer:

two bros chillin in a hot tub five feet apart cuz there not gay

Explanation:

do you remember this vine

Answer:

1) correct answer is ii  larger size

2) false, 3) false, 4) true, 5) true, 6) true

Explanation:

In this exercise, the answer is asked if the statement is true.

1) in the rapid cooling speed, there is no thermodynamic equilibrium, so the secondary phases do not have time to transform into the main one, therefore many phases appear in the products,

the correct answer is ii

2) False. The transformation of a material to the glass state requires a fixed temperature and rapid changes to reach this temperature,

3) False. The most stable state is the crystalline state, the glass states are metastable, their Gibbs energy is not the lowest possible and they must transition to the crystalline state over time, it can be years or centuries.

4) True. The melting and freezing temperatures change for each material, within the same material it always has the same value, since it corresponds to a change in the state of the system.

5) true. Cast iron is called gray because of the impurities inside that have not had time to move due to rapid cooling.

6) True. The microstructure is reduced in the process of cooling and heating

Answer:

diagram: see image, x-component: 84.3 N, acceleration: 4.38 m/s^2

Explanation:

(see image for further explanation)

Answer:

Explanation:

Gneiss is a high grade metamorphic rock, meaning that it has been subjected to higher temperatures and pressures than schist. However, unlike slate and schist, gneiss does not preferentially break along planes of foliation because less than 50% of the minerals formed during the metamorphism are aligned in thin layers.

Answer: IT IS TRUE

Explanation:

Hope this helps

Plyometrics can help a person maintain cardiorespiratory fitness T

It is TRUE that plyometrics can help a person maintain cardiorespiratory fitness

Plyometrics is a type of exercise training that works with the principle of using speed and force of different movements to build muscle power.

Plyometrics include different types of exercises such as pushups, throwing, running, jumping, and kicking.

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(a) The problem describes the time taken to execute one cycle of the motion. The period is T=0.754s.

(b) Frequency is simply the reciprocal of the period: f=1/T ≈1.3Hz, where the SI unit abbreviation Hz stands for Hertz, which means a cycle-per-second.

(c) Since 2π radians are equivalent to a cycle, the angular frequency ω (in radians per second) is related to frequency f by ω=2πf so that ω≈8.4rad/s.

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Range of  v0( 0 in subscript) is 2.67 m/s to 4.67 m/s range for marble peed to land in the hole.

There is no vertical component of velocity here, as per the problem.

h = 2.75 m

But horizontal distance x = v0t (v in subscript)

h = 1/2 gt2(t square)

⇒ t =\(\sqrt{ 2h/g}\)

Putting this in the 1st equation,

we get v0 = x/t =x\(\sqrt{9/2h}\)

Since the hole is 2m away and 1.5m wide ,

x lies between 2m and 3.5m

Lower bound of v0 = 2 × \(\sqrt{9.8/2 * 2.75}\)  = -2.67 m/s

Upper bound of v0 = 3.5 × \(\sqrt{9.8/2 * 2.75}\) = -4.67 m/s

Hence, the range of v0 is 2.67 m/s to 4.67 m/s.

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Because the refractive indexes of the immersion oil and the glass microscope slide are the same; the oil prevents the refraction of the incoming light rays.

An invisible space is present between the slide and the lens that contains air.

When the light rays fall on the slide and lens they might get refracted due to air present between them.

If the rays get refracted then the diameter of the objective lens will expand further.

So in order to prevent the refraction of light, it is very important to lubricate the surface of the lens because glass and oil have same refractive index and without oil the light rays refract from their original path.

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A **comparator** is a device commonly used in making a comparison between two objects.

A comparator is designed to measure and compare the properties or characteristics of two different objects or quantities. It can be a physical device, an instrument, or even a software-based tool. The purpose of a comparator is to determine the similarities or differences between the objects being compared.

Comparators are utilized in various fields and applications. For example, in metrology, comparators are used to measure and compare the dimensions, tolerances, or features of manufactured parts against established standards. In electronics, comparators are used to compare voltages or signals and determine their relationship (e.g., greater than, less than, equal to). In decision-making processes, comparators are employed to assess and evaluate different options or alternatives based on specific criteria.

Overall, a comparator serves as a valuable tool for conducting comparative analysis and aiding in decision-making processes across numerous disciplines.

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The measure of central tendency that should be used to calculate the cutoff time for the final race is the median.

Option C.

The median is the middle point in a dataset—half of the data points are smaller than the median and half of the data points are larger.

To find the median: Arrange the data points from smallest to largest. If the number of data points is odd, the median is the middle data point in the list.

So from the given data of the 100 meter dash, the measure of central tendency that should be used to calculate the cutoff time for the final race is the median.

The median will help to separate half of the data points that are smaller than the cutoff time and half of the data points are larger than the cutoff time.

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The most reasonable prediction Sarah can make for the total mass of the products of this reaction would be = 19g.

The law of conservation of mass states that mass in neither created nor destroyed but can be changed from one form to another.

From the set up of the reaction carried out by Sarah, the container was in an enclosed medium.

Therefore since there is no loss of mass, the total mass of the products of this reaction would be = 11+8 = 19g.

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The length of the rubber band that the boy must use is 0.024 m or 24 mm.

To determine the length of the rubber band, we can use the formula for the potential energy stored in a stretched spring, which is also applicable to a stretched rubber band:

where U is the potential energy stored in the rubber band, k is the spring constant (or in this case, the rubber band constant), and x is the displacement of the rubber band from its natural length.

Since the rubber band is stretched by 0.25 of its natural length, the displacement x is 0.25 times the natural length of the rubber band.

We can solve for the rubber band constant k by using the formula for the velocity of a projectile launched by a spring (or in this case, a rubber band):

where v is the velocity of the projectile, m is the mass of the rubber band, M is the mass of the projectile, and k is the spring constant. We can rearrange this equation to solve for k:

k = (v² M) / (2 m)

We can now combine the two equations to solve for the length of the rubber band, L:

U = 1/2 k x²

U = 1/2 ((v² M) / (2 m)) (0.25 L)²

U = (v² M L²) / (32 m)

The potential energy stored in the rubber band must be equal to the kinetic energy of the projectile when it is launched:

U = 1/2 M v²

(v² M L²) / (32 m) = 1/2 M v²

L = ((16 m v²) / (k M))

L = ((16 m v²) / ((v² M) / (2 m) M))

L = √(32 m^2 / M)

L = (0.032 M)

Substituting the given values, we get:

L = √(0.032 * 0.006)

L = 0.024 m

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